2007

TinI 4800 Na29Zn24Sn32: A Zintl Phase Containing a Novel Type of {Sn14} Enneahedra and

Heteroatomic {Zn8Sn14} Icosahedra. — Single crystals of the title compound are syn-thesized from stoichiometric mixtures of the elements (Ta ampule, 450 °C, slow cool-ing with 0.1 K/min) and characterized by single crystal XRD and extended Hueckel calculations. The compound crystallizes in the hexagonal space group P62m with Z = 1. The structure contains covalently linked [Zn8Sn4] icosahedra coexisting with a one-di-mensional covalently bonded homoatomic Sn substructure. The Sn substructure con-tains a new type of polyhedron, an enneahedron with 14 vertices, nine faces, and nearly equal edge lengths. — (KIM, S.-J.; HOFFMAN, S. D.; FAESSLER*, T. F.; Angew. Chem., Int. Ed. 46 (2007) 17, 3144-3148; Dep. Chem., TU Muenchen, D-85747 Garching, Germany; Eng.) — W. Pewestorf

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